Catalytic combustion of chlorobenzene over Ru-doped ceria catalysts

Abstract

CeO2 and Ru doped CeO2 nanoparticles with small particle sizes (∼7nm) and high surface area (∼100m2g−1) were prepared by a simple precipitation/coprecipitation method and aqueous NaOH solution (10wt%) as the precipitating agent, and characterized by XRD, N2 adsorption, TEM/HRTEM, Raman, XPS and H2-TPR. The catalytic combustion of chlorobenzene (CB) was investigated for the first time. The results revealed that the Ru doped CeO2 catalysts exhibit an outstanding catalytic activity (T90% below 250°C) and stability (at least 82h at 275°C) for CB decomposition. The better stability of the Ru-CeO2 catalysts can be ascribed to the inorganic chlorine species or dissociative Cl adsorbed on active sites can be removed rapidly via the Deacon process catalysized by RuO2 component with extraordinary stability (limited chlorination and easier Cl2 evolution).